From affae2bff825c1a8d2cfeaf7b270188d251d39d2 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sat, 17 Aug 2002 09:36:01 +0000
Subject: Initial revision

---
 net/rarp.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 net/rarp.c

(limited to 'net/rarp.c')

diff --git a/net/rarp.c b/net/rarp.c
new file mode 100644
index 0000000..279e650
--- /dev/null
+++ b/net/rarp.c
@@ -0,0 +1,106 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+#include <net.h>
+#include "bootp.h"
+#include "rarp.h"
+#include "tftp.h"
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+#define TIMEOUT		5		/* Seconds before trying BOOTP again */
+#ifndef	CONFIG_NET_RETRY_COUNT
+# define TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
+#else
+# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
+#endif
+
+
+int		RarpTry;
+
+/*
+ *	Handle a RARP received packet.
+ */
+static void
+RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3)
+{
+#ifdef	DEBUG
+	printf("Got good RARP\n");
+#endif
+	TftpStart ();
+}
+
+
+/*
+ *	Timeout on BOOTP request.
+ */
+static void
+RarpTimeout(void)
+{
+	if (RarpTry >= TIMEOUT_COUNT) {
+		puts ("\nRetry count exceeded; starting again\n");
+		NetStartAgain ();
+	} else {
+		NetSetTimeout (TIMEOUT * CFG_HZ, RarpTimeout);
+		RarpRequest ();
+	}
+}
+
+
+void
+RarpRequest (void)
+{
+	int i;
+	volatile uchar *pkt;
+	ARP_t *	rarp;
+
+	printf("RARP broadcast %d\n", ++RarpTry);
+	pkt = NetTxPacket;
+
+	NetSetEther(pkt, NetBcastAddr, PROT_RARP);
+	pkt += ETHER_HDR_SIZE;
+
+	rarp = (ARP_t *)pkt;
+
+	rarp->ar_hrd = ARP_ETHER;
+	rarp->ar_pro = PROT_IP;
+	rarp->ar_hln = 6;
+	rarp->ar_pln = 4;
+	rarp->ar_op  = RARPOP_REQUEST;
+	memcpy (&rarp->ar_data[0],  NetOurEther, 6);	/* source ET addr */
+	memcpy (&rarp->ar_data[6],  &NetOurIP,   4);	/* source IP addr */
+	memcpy (&rarp->ar_data[10], NetOurEther, 6);	/* dest ET addr = source ET addr ??*/
+	/* dest. IP addr set to broadcast */
+	for (i = 0; i <= 3; i++) {
+		rarp->ar_data[16 + i] = 0xff;
+	}
+
+	NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
+
+	NetSetTimeout(TIMEOUT * CFG_HZ, RarpTimeout);
+	NetSetHandler(RarpHandler);
+}
+
+#endif /* CFG_CMD_NET */
-- 
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